An investigation was carried out into the rate of reaction of calcium carbonate with dilute hydrochloric acid.
5.0 g of small lumps of calcium carbonate were reacted with 50 cm² of 0.50 mol dm- hydrochloric acid.
Another 5.0 g of the same sized lumps of calcium carbonate were reacted with 50 cm' of 1.0 mol dm-
hydrochloric acid.
The volume of gas collected in two minutes was recorded for each experiment.
The two experiments were then repeated, each using 5.0 g of large lumps of calcium carbonate.
Figure 4 shows the results.
volume of gas collected in cm
concentration of
hydrochloric acid
in moldm
small lumps of
calcium carbonate
large lumps of
calcium carbonate
0.50
17.2
3.1
1.0
35.1
5.6
Figure 4
Explain, in terms of collision of particles, how these results show the effect of the
size of the lumps of calcium carbonate and the effect of the concentration of the
acid on the rate of this reaction.